REFERENCES
Amatya, D., 1993. Forest Vegetation Analysis. Development Project, GCP/NEP/048/NOR. Kathmandu: His Majesty’s Government of Nepal and Food and Agriculture Organisation of the United Nations and possible ecological implications. Braz J Biol. 64: 563–568.
Arnold, S. E., Le Comber, C. S., Chittka, L. 2009. Flower color phenology in European grassland and woodland habitats, through the eyes of pollinators. Israel Journal of Plant Sciences . 57, 211–230.
Aslam, S., Rafi, M. A., Zia, A. 2017. Non–Apis bees of family Apidae (Hymenoptera) from Potohar region of Pakistan. Journal of Entomology and Zoology Studies . 5, 6–12.
Bashir, M. A., Saeed, S., Sajjad, A., Khan, K. A., Ghramh, H. A., Shehzad, M. A., Ansari, M. J. 2019. Insect pollinator diversity in four forested ecosystems of southern Punjab, Pakistan. Saudi journal of biological sciences . 26(7), 1835–1842.
Bingham, C. T. 1897. The Fauna of British India, Including Ceylon and Burma. Hymenoptera–Vol. 1. Wasps and Bees.https://doi.org/10.5962/bhl.title.100738.
Bodlah, I., Amjad, M., Bodlah, M.A. and Qayyum, A., 2016. First record of two genera of Anthophorini and one genus of Melectini (Apinae: Apidae: Hymenoptera) from Pothwar Punjab, Pakistan. Journal of Entomology and Zoology Studies . 4:1031–1035.
Brunetti, E. 1923. Pipunculidae, Syrphidae, Conopidae, Oestridae. Diptera. Vol. 3, xi + 424 pp., 6 pis. In [Shipley, A. E.] (Eds.), The Fauna of British India, including Ceylon and Burma. Taylor and Francis, London .
Cameron, S.A., Lozier, J.D., Strange, J.P., Koch, J.B., Cordes, N., Solter, L.F. and Griswold, T.L., 2011. Patterns of widespread decline in North American bumble bees. Proceedings of the National Academy of Sciences108 (2), pp.662–667.
Carreck, N.L. and Williams, I.H., 2002. Food for insect pollinators on farmland: insect visits to flowers of annual seed mixtures. Journal of Insect Conservation6 (1), pp.13–23.
Carvalheiro, L.G., Kunin, W.E., Keil, P., Aguirre‐Gutiérrez, J., Ellis, W.N., Fox, R., Groom, Q., Hennekens, S., Van Landuyt, W., Maes, D. and Van de Meutter, F., 2013. Species richness declines and biotic homogenisation have slowed down for NW‐European pollinators and plants. Ecology letters16 (7), pp.870–878.
Chaguthi, G. and Dyola, U., 2018. Insect Visitors of White Clover (Trifolium Repens L) and Their Relation With Environmental Variables in the Premises of Bhaktapur Multiple Campus, Nepal. Journal of Institute of Science and Technology22 (2), pp.86–91.
Clarke, K.R. and Gorley, R.N., 2001. Primer V5 (Plymouth routines in multivariate ecological research): user manual/tutorial . Primer–e.
Claussen, C.J. and Weipert, J., 2003. Zur Schwebfliegenfauna Nepals (Insecta: Diptera: Syrphidae) unter besonderer Berücksichtigung Westnepals. Biodiversität und Naturausstattung im Himalaya. Verein der Freunde und Förderer des Naturkundemuseums Erfurt ev, Erfurt , pp.343–380.
Coe, R.L. 1964. Diptera from Nepal. Bulletin of the British Museum of Natural History, Entomology . 15, 255–290.
Corbet, S.A., Williams, I.H. and Osborne, J.L., 1991. Bees and the pollination of crops and wild flowers in the European Community. Bee world72 (2), pp.47–59.
De Groot, R.S., Alkemade, R., Braat, L., Hein, L. and Willemen, L., 2010. Challenges in integrating the concept of ecosystem services and values in landscape planning, management and decision making. Ecological complexity7 (3), pp.260–272.
Dirzo, R., Young, H.S., Galetti, M., Ceballos, G., Isaac, N.J. and Collen, B., 2014. Defaunation in the Anthropocene. science345 (6195), pp.401–406.
Erbar, C. and Leins, P., 2013. Nectar production in the pollen flower of Anemone nemorosa in comparison with other Ranunculaceae and Magnolia (Magnoliaceae). Organisms Diversity & Evolution13 (3), pp.287–300.
Evans, L.C., Sibly, R.M., Thorbek, P., Sims, I., Oliver, T.H. and Walters, R.J., 2020. The importance of including habitat–specific behaviour in models of butterfly movement. Oecologia193 (2), pp.249–259.
Everaars, J., Strohbach, M.W., Gruber, B. and Dormann, C.F., 2011. Microsite conditions dominate habitat selection of the red mason bee (Osmia bicornis, Hymenoptera: Megachilidae) in an urban environment: A case study from Leipzig, Germany. Landscape and Urban Planning103 (1), pp.15–23.
Fitzpatrick, Ú., Murray, T.E., Paxton, R.J., Breen, J., Cotton, D., Santorum, V. and Brown, M.J., 2007. Rarity and decline in bumblebees–a test of causes and correlates in the Irish fauna. Biological conservation136 (2), pp.185–194.
Franzén, M., Larsson, M. and Nilsson, S.G., 2009. Small local population sizes and high habitat patch fidelity in a specialised solitary bee. Journal of Insect Conservation13 (1), pp.89–95.
Fussell, M. and Corbet, S.A., 1992. Flower usage by bumble–bees: a basis for forage plant management. Journal of Applied Ecology , pp.451–465.
Gathmann, A. and Tscharntke, T., 2002. Foraging ranges of solitary bees. Journal of animal ecology71 (5), pp.757–764.
Ghorpadé, K. 1994. Diagnostic keys to new and known genera and species of Indian subcontinent Syrphini (Diptera: Syrphidae). Colemania: Insect Biosystematics. 3, 1–15.
Ghorpadé, K. 2016. Indian subcontinent species of Syritta Le Peletier & Serville Diagnostic characters of eight species.
Ghorpadé, K., 1994. Diagnostic keys to new and known genera and species of Indian subcontinent Syrphini (Diptera: Syrphidae). Colemania: Insect Biosystematics3 , pp.1–15.
Gilbert, L.E., 1972. Pollen feeding and reproductive biology of Heliconius butterflies. Proceedings of the National Academy of Sciences69 (6), pp.1403–1407.
Gill, R.J., Baldock, K.C., Brown, M.J., Cresswell, J.E., Dicks, L.V., Fountain, M.T., Garratt, M.P., Gough, L.A., Heard, M.S., Holland, J.M. and Ollerton, J., 2016. Protecting an ecosystem service: approaches to understanding and mitigating threats to wild insect pollinators. Advances in ecological research54 , pp.135–206.
Gittings, T., O’Halloran, J., Kelly, T. and Giller, P.S., 2006. The contribution of open spaces to the maintenance of hoverfly (Diptera, Syrphidae) biodiversity in Irish plantation forests. Forest ecology and management237 (1–3), pp.290–300.
Greenleaf, S.S., Williams, N.M., Winfree, R. and Kremen, C., 2007. Bee foraging ranges and their relationship to body size. Oecologia153 (3), pp.589–596.
Hammer, Ø., Harper, D.A. and Ryan, P.D., 2001. PAST: Paleontological statistics software package for education and data analysis. Palaeontologia electronica4 (1), p.9.
Haslett, J.R., 1989. Adult feeding by holometabolous insects: pollen and nectar as complementary nutrient sources for Rhingia campestris (Diptera: Syrphidae). Oecologia81 (3), pp.361–363.
Hassan, M. A., Bodlah, I., Aihetasham, A., Bodlah, M. A., Hussain, K. 2019 First Record of Baccha maculata Walker, 1852 (Diptera: Syrphidae) from the Pothwar Punjab, Pakistan. Punjab University Journal of Zoology . 34, 133–135.
http://dx.doi.org/10.1016/j.landurbplan.2011.05.008.
Hassan, M.A., Bodlah, I., Ahmad, M., Kayani, A.R. and Mahmood, K., 2020. First record of the genus Graptomyza Wiedemann, 1830 (Diptera: Syrphidae) from Pakistan. The Journal of Animal and Plant Sciences30 (2), pp.512–516.
Herrera, C.M., 1987. Components of pollinator” quality”: comparative analysis of a diverse insect assemblage. Oikos , pp.79–90.
Hicks, D.M., Ouvrard, P., Baldock, K.C., Baude, M., Goddard, M.A., Kunin, W.E., Mitschunas, N., Memmott, J., Morse, H., Nikolitsi, M. and Osgathorpe, L.M., 2016. Food for pollinators: quantifying the nectar and pollen resources of urban flower meadows. PloS one11 (6), p.e0158117.
Hudewenz, A., Klein, A.M., Scherber, C., Stanke, L., Tscharntke, T., Vogel, A., Weigelt, A., Weisser, W.W. and Ebeling, A., 2012. Herbivore and pollinator responses to grassland management intensity along experimental changes in plant species richness. Biological Conservation150 (1), pp.42–52.
Irungbam, J.S., Huidrom, H. and Soibam, B.S., 2017. Range extension of the Indian Tortoiseshell Aglais caschmirensis aesis (Fruhstorfer, 1912)(Lepidoptera: Nymphalidae) into the hills of Manipur, India. Journal of threatened taxa9 (10), pp.10860–10864.
Janz, N., 2005. The relationship between habitat selection and preference for adult and larval food resources in the polyphagous butterfly Vanessa cardui (Lepidoptera: Nymphalidae). Journal of Insect Behavior18 (6), pp.767–780.
Jauker, F., Diekoetter, T., Schwarzbach, F. and Wolters, V., 2009. Pollinator dispersal in an agricultural matrix: opposing responses of wild bees and hoverflies to landscape structure and distance from main habitat. Landscape Ecology24 (4), pp.547–555.
Jennersten, O., 1984. Flower visitation and pollination efficiency of some North European butterflies. Oecologia63 (1), pp.80–89.
Kambach, S., Guerra, F., Beck, S.G., Hensen, I. and Schleuning, M., 2013. Human–induced disturbance alters pollinator communities in tropical mountain forests. Diversity5 (1), pp.1–14.
Kearns, C.A., 1992. Anthophilous fly distribution across an elevation gradient. American Midland Naturalist , pp.172–182.
Kearns, C.A., Inouye, D.W. and Waser, N.M., 1998. Endangered mutualisms: the conservation of plant–pollinator interactions. Annual review of ecology and systematics29 (1), pp.83–112.
Kevan, P.G., Clark, E.A. and Thomas, V.G., 1990. Insect pollinators and sustainable agriculture. American Journal of Alternative Agriculture5 (1), pp.13–22.
Kovács‐Hostyánszki, A., Espíndola, A., Vanbergen, A.J., Settele, J., Kremen, C. and Dicks, L.V., 2017. Ecological intensification to mitigate impacts of conventional intensive land use on pollinators and pollination. Ecology Letters20 (5), pp.673–689.
Kremen, C., 2008. Crop pollination services from wild bees. Bee pollination in agricultural ecosystems , pp.10–26.
Kühsel, S. and Blüthgen, N., 2015. High diversity stabilizes the thermal resilience of pollinator communities in intensively managed grasslands. Nature communications6 (1), pp.1–10.
Kumari, P., Kumar, N.R., Sidhu, A.K. and Chandra, K., 2018. Taxonomical and behavioural studies on Megachile conjuncta (Fabricius)(Hymenoptera: Megachilidae: Cressoniella).
Larson, B.M.H., Kevan, P.G. and Inouye, D.W., 2001. Flies and flowers: taxonomic diversity of anthophiles and pollinators. The Canadian Entomologist133 (4), pp.439–465.
LeBuhn, G., Griswold, T., Minckley, R., Droege, S., Roulston, T.A., Cane, J., Parker, F., Buchmann, S., Tepedino, V., Williams, N. and Kremen, C., 2003. A standardized method for monitoring bee populations–the bee inventory (BI) plot. Accessed16 , p.15.
Lepš, J. and Šmilauer, P., 2003. Multivariate analysis of ecological data using CANOCO . Cambridge university press.
Lieftinck, M.A., 1966. Notes on some anthophorine bees, mainly from the Old World (Apoidea). Tijdschrift voor Entomologie109 (6), pp.125–161.
Losey, J.E. and Vaughan, M., 2006. The economic value of ecological services provided by insects. Bioscience56 (4), pp.311–323.
Mani, M. S. 1962. Introduction to high altitude Entomology insect life above the timber–line in the north–west Himalaya (No. 595.70954 M3).
Masters, J.A. and Emery, S.M., 2015. The showy invasive plant Ranunculus ficaria facilitates pollinator activity, pollen deposition, but not always seed production for two native spring ephemeral plants. Biological Invasions17 (8), pp.2329–2337.
McKinney, A.M. and Goodell, K., 2010. Shading by invasive shrub reduces seed production and pollinator services in a native herb. Biological Invasions12 (8), pp.2751–2763.
Meyer, B., Jauker, F. and Steffan–Dewenter, I., 2009. Contrasting resource–dependent responses of hoverfly richness and density to landscape structure. Basic and Applied Ecology10 (2), pp.178–186.
Moquet, L., Laurent, E., Bacchetta, R. and Jacquemart, A.L., 2018. Conservation of hoverflies (Diptera, Syrphidae) requires complementary resources at the landscape and local scales. Insect Conservation and Diversity11 (1), pp.72–87.
Ngat, T. T., Minh, N. P., Lam, T. X., Thi, N., Lien, P. 2017. Studies of the Genus Thyreus Panzer ( Hymenoptera : Apidae : Apinae ) with Six New Records from Vietnam. 9, 227–236.
Nielsen, A., Steffan–Dewenter, I., Westphal, C., Messinger, O., Potts, S.G., Roberts, S.P., Settele, J., Szentgyörgyi, H., Vaissière, B.E., Vaitis, M. and Woyciechowski, M., 2011. Assessing bee species richness in two Mediterranean communities: importance of habitat type and sampling techniques. Ecological research26 (5), pp.969–983.
Oksanen, J., Blanchet, F.G., Kindt, R., Legendre, P., Minchin, P.R., O’hara, R.B., Simpson, G.L., Solymos, P., Stevens, M.H.H., Wagner, H. and Oksanen, M.J., 2013. Package ‘vegan’. Community ecology package, version2 (9), pp.1–295.
Oliver, T., Roy, D.B., Hill, J.K., Brereton, T. and Thomas, C.D., 2010. Heterogeneous landscapes promote population stability. Ecology letters13 (4), pp.473–484.
Pinheiro, L.A., Torres, L.M., Raimundo, J. and Santos, S.A., 2015. Effects of pollen, sugars and honeydew on lifespan and nutrient levels of Episyrphus balteatus. BioControl60 (1), pp.47–57.
Pollard, E. and Yates, T.J., 1994. Monitoring butterflies for ecology and conservation: the British butterfly monitoring scheme . Springer Science & Business Media.
Potts, S.G., Biesmeijer, J.C., Kremen, C., Neumann, P., Schweiger, O. and Kunin, W.E., 2010. Global pollinator declines: trends, impacts and drivers. Trends in ecology & evolution25 (6), pp.345–353.
Potts, S.G., Vulliamy, B., Dafni, A., Ne’eman, G. and Willmer, P., 2003. Linking bees and flowers: how do floral communities structure pollinator communities?. Ecology84 (10), pp.2628–2642.
Proesmans, W., Bonte, D., Smagghe, G., Meeus, I. and Verheyen, K., 2019. Importance of forest fragments as pollinator habitat varies with season and guild. Basic and applied ecology34 , pp.95–107.
Reemer, M., 2005. Saproxylic hoverflies benefit by modern forest management (Diptera: Syrphidae). Journal of insect conservation9 (1), pp.49–59.
Rundlöf, M., Nilsson, H. and Smith, H.G., 2008. Interacting effects of farming practice and landscape context on bumble bees. Biological conservation141 (2), pp.417–426.
Sankararaman, H., Daniel, J. A., Manickavasagam, S. and Pennards, G., 2020. First record of two interesting genera of hover flies (Diptera: Syrphidae) in South India. Journal of Insect Biodiversity ,14 (2), pp.54–63.
Sengupta, J., Naskar, A., Maity, A., Hazra, S., Sarkar, N.K. and Banerjee, D., 2017. Hover Flies (Diptera: Syrphidae) from Darjeeling Himalaya—A Part of Indo–Burmese Hotspot. Indian Journal of Entomology79 (3), pp.336–353.
Sharp, M.A., Parks, D.R. and Ehrlich, P.R., 1974. Plant resources and butterfly habitat selection. Ecology55 (4), pp.870–875.
Sjödin, N.E., Bengtsson, J. and Ekbom, B., 2008. The influence of grazing intensity and landscape composition on the diversity and abundance of flower‐visiting insects. Journal of Applied Ecology45 (3), pp.763–772.
Smith, C. 2011 Illustrated checklists of Nepal’s butterflies. Mujpuria Publication, Craftman Press, Bangkok, Thailand.
SNNP, 2017. Shivapuri–Nagarjun National Park and Buffer Zone, Management Plan. Kathmandu: Shivapuri–Nagarjun Park Office, Panimuhan, Kathmandu, Nepal.
Stanley, D.A., 2013. Pollinators and Pollination in Changing Agricultural Landscapes: Investigating the Impacts of Bioenergy Crops  (Doctoral dissertation, Trinity College Dublin).
Subedi, C.K., Rokaya, M.B., Münzbergová, Z., Timsina, B., Gurung, J., Chettri, N., Baniya, C.B., Ghimire, S.K. and Chaudhary, R.P., 2020. Vascular plant diversity along an elevational gradient in the Central Himalayas, western Nepal. Folia Geobotanica55 (2), pp.127–140.
Subhan, F. 2016. Taxonomic study of Syrphidae (Diptera) of Northern dry mountains region of Pakistan (Doctoral dissertation, The University of Agriculture, Peshawar–Pakistan).
Sutherland, W.J., 1996. 11 The twenty commonest surveying sins. Ecological Census Techniques: A Handbook , p.317.
Sydenham, M.A., Häusler, L.D., Moe, S.R. and Eldegard, K., 2016. Inter‐assemblage facilitation: The functional diversity of cavity‐producing beetles drives the size diversity of cavity‐nesting bees. Ecology and evolution6 (2), pp.412–425.
Szigeti, V., Kőrösi, Á., Harnos, A., Nagy, J. and Kis, J., 2016, September. Comparing two methods for estimating floral resource availability for insect pollinators in semi–natural habitats. In Annales de la Société entomologique de France (NS)  (Vol. 52, No. 5, pp. 289–299). Taylor & Francis.
Tadauchi, O. and Matsumura, T., 2007. The genus Andrena collected from Nepal (Hymenoptera, Andrenidae) with redescriptions of some types of Andrena described from North India. Esakia47 , pp.1–20.
Tiple, A.D., Deshmukh, V.P. and Dennis, R.L., 2005. Factors influencing nectar plant resource visits by butterflies on a university campus: implications for conservation. Nota lepidopterologica28 (3/4), p.213.
Van Swaay, C.C., Cuttelod, A., Collins, S., Maes, D., Munguira, M.L., Šašić, M., Settele, J., Verovnik, R., Verstrael, T., Warren, M. and Wiemers, M., 2010. European red list of butterflies.
Vanbergen, A.J. and Initiative, T.I.P., 2013. Threats to an ecosystem service: pressures on pollinators. Frontiers in Ecology and the Environment11 (5), pp.251–259.
VanEngelsdorp, D., Hayes Jr, J., Underwood, R.M. and Pettis, J., 2008. A survey of honey bee colony losses in the US, fall 2007 to spring 2008. PloS one3 (12), p.e4071.
Vulliamy, B., G. Potts, S. and G. Willmer, P., 2006. The effects of cattle grazing on plant‐pollinator communities in a fragmented Mediterranean landscape. Oikos114 (3), pp.529–543.
Warren, M.S., Hill, J.K., Thomas, J.A., Asher, J., Fox, R., Huntley, B., Roy, D.B., Telfer, M.G., Jeffcoate, S., Harding, P. and Jeffcoate, G., 2001. Rapid responses of British butterflies to opposing forces of climate and habitat change. Nature414 (6859), pp.65–69.
Warren, S.D., Harper, K.T. and Booth, G.M., 1988. Elevational distribution of insect pollinators. American Midland Naturalist , pp.325–330.
Weibull, A.C., Bengtsson, J. and Nohlgren, E., 2000. Diversity of butterflies in the agricultural landscape: the role of farming system and landscape heterogeneity. Ecography23 (6), pp.743–750.
Westphal, C., Bommarco, R., Carré, G., Lamborn, E., Morison, N., Petanidou, T., Potts, S.G., Roberts, S.P., Szentgyörgyi, H., Tscheulin, T. and Vaissière, B.E., 2008. Measuring bee diversity in different European habitats and biogeographical regions. Ecological monographs78 (4), pp.653–671.
Wickham, H., Chang, W. and Wickham, M.H., 2016. Package ‘ggplot2’. Create Elegant Data Visualisations Using the Grammar of Graphics. Version2 (1), pp.1–189.
Widhiono, I., Sudiana, E. and SUCIANTO, E.T., 2016. Insect pollinator diversity along a habitat quality gradient on Mount Slamet, Central Java, Indonesia. Biodiversitas Journal of Biological Diversity17 (2).
Willcox, B.K., Howlett, B.G., Robson, A.J., Cutting, B., Evans, L., Jesson, L., Kirkland, L., Jean–Meyzonnier, M., Potdevin, V., Saunders, M.E. and Rader, R., 2019. Evaluating the taxa that provide shared pollination services across multiple crops and regions. Scientific reports9 (1), pp.1–10.
Williams, P.H., Ito, M., Matsumura, T. and Kudo, I., 2010. The bumblebees of the Nepal Himalaya (Hymenoptera: Apidae). Insecta matsumurana. New series: journal of the Faculty of Agriculture Hokkaido University, series entomology.66 , pp.115–151.
Willmer, P.G., 1983. Thermal constraints on activity patterns in nectar‐feeding insects. Ecological Entomology8 (4), pp.455–469.
Wojcik, V., 2021. Pollinators: Their Evolution, Ecology, Management, and Conservation. In Arthropods . IntechOpen.